Outlet-box support



July 3, 1928.

c. A. LUNDBERG OUTLET BOX SUPPORT Filed Feb. 11, 1926 GOO GOO CD00 5 INVENTOR. Q/f fl/Jazza eigg, M 4,

A TTORNEYS.

Patented July 3, 1928.

STATES CHARLES A. LUNDBERG, OF CHICAGO, ILLINOIS.

OUTLET-BOX SUPPORT.

Application filed February 11, 1926.

s is to be embedded in the concrete, the support being of a character such that the operation of temporarily supporting the box in position for the concrete pouring operation is facilitated.

In concrete building construction and more especially in the formation of concrete floors, it is common practice to employ hollow liller members, commonly known as pans, which are supported in rows with the pans arranged in end to end'relation and supported at their opposite side edges upon a wooden structure, commonly termed the false work. The false work comprises a plurality of elongated supporting members each in the form of planks arranged in parallel relation and spaced apart a distance somewhat less than the width of the pans so that the opposite edges of the pans may rest upon two adjacent supporting members. vVhere outlet boxes are to be provided in the ceiling ofthe room beneath a given floor, a space is provided between the adjacent pans at the proper point, and the outlet box is supported in this space with the desired conduits connected to the box.

It is necessary that the outlet box be supported so as to be embedded in the concrete which is poured into the space between the pans with the lower edge of the box substantially flush with the lowermost face of the concrete. Heretofore, it has been the practice in thus supporting the outlet box for the electrician to cut from a plank a piece of a length such as to fit in between the two spaced longitudinal supporting members and to fasten this piece, usually by toenailing into the adjoining side edges of the supporting members. This operation is difficult and troublesome for the electrician to perform and consumes a substantial amount of time. It is thus costly from the standpoint of the time spent as well as because of the material employed.

The object of my invention, more specifically stated, is to provide a device for supporting an outlet box of a character such that not only is the operation greatly simplified, but the cost of the support materially reduced.

Briefly stated, I attain this object by means of a plate formed of sheet metal and Serial No. 87,486.

adapted to permit an outlet box to be quickly and easily secured in position thereon and readily removed together with the false work after the concrete has been poured and set.

In the accompanying drawings I have shown a preferred embodiment only of my invention, but it should be understood that it is contemplated that various changes in the construction and arrangement shown and hereinafter more particularly Set forth may be made by those skilled in the art without departing from the spirit and scope of the invention as expressed in the appended claims.

Figure l of the drawings is a plan view of my improved supporting device.

Figs. 2 and 3 are respectively edge and end views of the same.

Fig. at is a fragmentary vertical sectional view though a section of a concrete floor having an outlet box supported therein in accordance with my invention, the supporting device and false work being shown in position.

Fig. 5 is a fragmentary plan view of a portion of the floor structure before the concrete is poured.

Referring first to Figs. 4; and 5, 7 designates the hollow filler members or pans, com monly employed, which are supported at opposite side edges upon planks 8 formingpart of the false work, these planks being arranged in parallel relation spaced apart a distance somewhat less than the width of the pans as shown clearly in Fig, 4. 9 designates an outlet box of ordinary construction to accommodate which adjacent pans are spaced apart longitudinally of the supporting members or planks 8, a suitable number of conduits 10 being shown connected with the outlet box and bent over the pans so as to be embedded in the concrete, in the usual way.

The device which I have provided for supporting the outlet box in position between the pans, so that when the concrete is poured it will be embedded therein, comprises a relatively thin elongated sheet metal plate 11 preferably having stiffening means such as downturned side flanges 12, the latter terminating short of the ends of the plate so that such ends may rest flat upon the planks 8. Extending longitudinally of the plate centrally thereof is a row of holes 13 suit.- ably spaced apart and at the ends of the Ill) ' jects some distance above the-top of the outlet box and may have a transversely arranged anchoring pin 18 therein. I utilize this stud 15 together with its lock nuts 16 and 17 to tasten'the outlet box to the supporting plate 11. thestud is passed through one of the holes 13 in the plate 11 depending upon the particular location desired for the outlet box in the space between the two pans 7. The nut 16 bears upon the top wall of the outlet box and the nut 17 is threaded onto the lower projectingend of the stud 15 to firmly secure the box in position upon the plate 11.

As shown clearly in Fig. 5, the supporting device 11 is first secured in proper position :in bridging relation otthe spaced planks 8 of the vfalse work, and its opposite ends nailed or otherwise secured to the planks. The pans7 arethen arranged sothat their lower flanged ends terminate adjacent the spaced pans 7 and firmly supports the outside edges of the plate preferably resting upon such side edges of the plate as shown in Fig.6. The: plate 11 thus serves'to close the bottonrot the space between the two let box with its loweredges flush withthe bottoms of the pans. As a result, when the concrete is poured ,it surrounds theoutlet box andthe latterbecomes firmlyembedded in thesconcrete.

Thus the lower end of.

port ng dev ce, moreover, is substantially After the concrete has set andbetore removing the false work, the nut 17 is removed so .that the supporting plate 11 may be re- 3 simplicity of the construction of my improved-supporting device, it may-be made verycheaplyithus elfecting a substantial reduction in the cost of the material employed for supporting an outlet box. Furthermore, thefixture stud of the outlet box is utilized for tasteningthe box in place uponthe supporting device. The time required on the part of the workman in inserting this supless than is required in the case of the method heretoforein common use.

I claim as my invention:

An outlet box support for use in concrete construction co 'nprising a substantially flat metallic plate of alengthsuch that the opposite ends thereof are adapted to rest-upon the upper surfaces of two adjacent parallel supporting members, said plate being made of thin sheet metal so that the ends of filler pansspaced aparton said supporting membersanay overlap theside edges of the plate resting on top oi the supporting members, and stifl'ening means for the plate extending longitudinallythereof but terminating short oft-he end portionsot the plate which are adapted to rest upon the spaced supporting 'members, saidplatebeing apertured to per- .mit the passage of securing means therethrough whereby an outlet box may be temporarily secured in position upon thenpper side of the plate between said pans.

In testimony whereof,.I have hereunto aflixed my signature.

CHARLES A. LUNDBERG. 

